STINNER Victor added the comment:
2013/11/5 Alexander Belopolsky <rep...@bugs.python.org>:
> +1 on adding an option to isoformat(). We already have an optional <sep>
> argument, so the symmetry with __str__ is not complete. To make this option
> more useful, rather than implementing always_emit_microseconds=False flag, I
> would add a keyword argument 'precision' that would take
> ('hour'|'minute'|'second'|millisecond'|'microsecond') value.
Hour precision is not part of the ISO 8601 standard.
"resolution" is maybe a better name for the new parameter than "precision":
http://www.python.org/dev/peps/pep-0418/#glossary
The new parameter should be added to datetime.datetime.isoformat() but
also datetime.time.isoformat().
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<http://bugs.python.org/issue19475>
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